![]() Remove the thermostat housing (Refer to 7 - COOLING/ENGINE/ENGINE COOLANT THERMOSTAT - REMOVAL). Remove the lead away hose, flushing gun, water supply hose and air supply hose. For more information, refer to operating instructions supplied with flushing equipment. Continue until clean water flows through the lead away hose. When the engine is filled, apply air in short blasts, allowing the system to fill between air blasts. This is done to prevent coolant flow with scale and other deposits from entering the heater core.Connect the water supply hose and air supply hose to the flushing gun. Attach a lead away hose to the water pump inlet fitting.ĬAUTION: Be sure that the heater control valve is closed (heat off). Disconnect the radiator lower hose from the water pump. Disconnect the radiator upper hose from the radiator and attach the flushing gun to the hose. Remove the thermostat housing and thermostat. REVERSE FLUSHING ENGINEĭrain the cooling system (Refer to 7 - COOLING - STANDARD PROCEDURE). Have radiator cleaned more extensively by a radiator repair shop. Continue this reverse flushing until clean water flows out through rear of radiator cooling tube passages. When radiator is filled, apply air in short blasts allowing radiator to refill between blasts. Exceeding this pressure may damage the radiator or hoses. CAUTION: The cooling system normally operates at 97-to-110 kPa (14- to-16 psi) pressure. Connect a water supply hose and air supply hose to the flushing gun. Attach a section of radiator hose to the radiator bottom outlet fitting and insert the flushing gun. REVERSE FLUSHING RADIATORĭisconnect the radiator hoses from the radiator fittings. CAUTION: Be sure instructions on the container are followed. This will soften scale and other deposits and aid the flushing operation. If visual inspection indicates the formation of sludge or scaly deposits, use a radiator cleaner (Mopar Radiator Kleen or equivalent) before flushing. ![]() It is usually only necessary with very dirty systems with evidence of partial plugging. This is done using air pressure in the opposite direction of normal coolant flow. ![]() Reverse flushing of the cooling system is the forcing of water through the cooling system. STANDARD PROCEDURE - COOLING SYSTEM - REVERSE FLUSHINGĬAUTION: The cooling system normally operates at 97-to-110 kPa (14-to -16 psi) pressure. Allow coolant to drain into the container until emptied. If there is coolant in the overflow side of the coolant bottle (after several warm/cold cycles of the engine) and coolant level is above cold full when cold, disconnect the end of the overflow hose at the fill neck and lower it into a clean container. The inboard chamber should normally be empty. The inboard chamber is only to recover coolant in the event of an overheat or after a recent service fill. Coolant will normally only be in the outboard (larger) of the two. NOTE: The coolant bottle has two chambers. Coolant level in a warm engine will be higher due to thermal expansion. Only add coolant to the pressure bottle when the engine is cold. (4) Add coolant to pressure bottle as necessary. ![]() (3) With heater control unit in the HEAT position, operate engine with pressure bottle cap in place. Removing the pressure cap breaks the vacuum path between the two bottle sections and the coolant will not return to cooling system. If the engine cooling system overheats and pushes coolant into the overflow side of the coolant bottle, this coolant will be sucked back into the cooling system ONLY IF THE PRESSURE CAP IS LEFT ON THE BOTTLE. As a result, a drop in coolant level in the pressure bottle may occur. NOTE: The engine cooling system will push any remaining air into the coolant bottle within about an hour of normal driving. Fill pressure bottle to service line.and install cap. Fill system using a 50/50 mixture of Mopar Hoat or Zerex G05 coolant and low mineral content water. (1) Tighten the radiator draincock and the cylinder block drain plug(s) (if removed).ĬAUTION: Failure to purge air from the cooling system can result in an overheating condition and severe engine damage. When tank is empty, remove radiator cap and continue draining cooling system. The coolant does not have to be removed from the tank unless the system is being refilled with a fresh mixture. This will empty the coolant reserve/overflow tank. Open draincock and drain coolant from radiator. Put the other end into a clean container. (2) Attach one end of a hose to the draincock.
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